Heating attachment for stove or furnace pipes



July 8 1924.

H.. MULLER HEATING ATTACHMENT FOR STOVE OR FURNACE PIPES Filed March 23192} 777 IM ENTOR. wzesx; i l/ 7 ,4 ATTORNEY.

Patented July 8, 1924.

HENRY IVIIILLER, OF KANSAS CITY, MISSOURI.

HEATING ATTACHIVIENT FOR STOVE OR FURNACE PIPES Application filed March23,1922. Serial No. 546,102.

v T alt whom it may concern.

Be 1t known that I, HENRY MIILLER, a citizen of the United States,residing at Kansas City, in the county of Jackson and I 5 StateofMissouri, have invented certain .new and useful Improvement in HeatingAttachments for Stove or Furnace Pipes, of which the following is aspecification.

My invention relates toimprovements in heating attachments for stove orfurnace pipes. p One of the objects of my invention is to provide anattachment adapted to be connected with a smoke pipe of a, stove orfurnace, by means of which a great saving in fuel is effected, whichgreatly reduces the heat dischargedfrom the flue, which is simple inconstruction, cheap to make, durable, not liable to get out of order,which may be readily attached to the smoke pipe of a stove or furnacenow in use, which maybe readily cleaned, and which is' efficient inoperation. In carrying my invention into effect, the gaseous products ofcombustion on the way from the stove to the flue are. carried through adrum having an expansion chamher in directions first downwardly, thenupwardly and then downwardly, after which the products are dischargedinto the flue.

In the accompanying drawing, which illustrates the invention, 7 V V Fig.1 is a view partly in sideelevation and fine of ordinary type providedwith my improvement.

Fig. 2 is a horizontal section on the line 22 of Fig. 1.

Fig. 3 is a vertical sectional view on the line 3-3 of Fig. 2.

Similar reference characters designate similar parts in the diiferentviews.

1 designates the combustion chamber of an ordinary furnace, to which isconnected a horizontal smoke pipe 2, which discharges into a flue 3.

The lower side of the pipe 2 is provided with two lateral openings 4 and5. In the smoke pipe 2, intermediate of the openings 4 and 5, is adamper 6, Fig. 1. 7 designates an upright drum having closed upper andlower ends and provided in one side near the bottom with a dischargeopening 8, with preferred embodiment of my and partly in verticalsectionof a furnace which communicates the lower end of a pipe 9, the upper endof which communicates with the opening 5. r V

Mounted in the drum 7 is a cup-shaped member 10, having its bottomdisposed above the opening 8, and havingits upper end spaced apart fromthe-top of the drum 7, and which forms withthe latter an expansionchamber 11. preferably octagonal in cross section, and the drum 7 ispreferably substantially square in cross section. Four of the sidesofthe cup-shaped member 10 are fastened The member 10 is respectively byrivets-12 to the inner sides of the four walls of the drum 7 By means ofthis construction, four vertical passages 13, Fig. 2, are providedbetween the. side walls of the cup-shaped member and the drum.

Mounted in the top of the drum 7 is a vertical pipe l t, the upper endof which" communicates with the opening 4, and the lower end of which isdisposed above and spacedapart from the bottom of the meni ber 10. r

In order that the drum may be readily cleaned of soot, one side of thedrum is provided with an opening 15, which extends above and below thebottom of the member 10 and which door 16.

For obtaining the most eflicient results with my improvemenuthe drumin.connec is normally closed by a tion therewith should be as, nearlyairtight i as possible. V

In the operation of my invention,'.-the gaseous products of combustionpassing from the combustion chamber 1 into the smoke pipe 2, will, whenthe damper 6 is closed, pass as indicated by the arrows in Figs. 1 and3, first downwardly throughand out of the pipe '14:, into the cup-shapedchamber 10, which is of such relatively large diameter that the gaseousproducts of combustion will be greatly expanded. The gaseous productswill pass upwardly in the expansion chamber and then downwardly throughthe passages 13, thence under the member 10 to and through the dischargeopening 8, and thence upwardly to the flue 3 through the pipe 9 and pipe2.

i In starting the fire, the damper 6 is opened to furnish direct draft.After cornbustion has been well established, the damper g I a 1,500,838

expansion chamber, whereby the gaseous productslose by radiation beforereaching the flue a very large amount of their heat, The temperature,therefore, of the gaseous products which are discharged fromthe fluewill be very much lower than when the products are discharged directlythrough 'thevpipe 2 to the flue, that is, when the damper 6 is in theopen position and the gaseous products are not compelled topass throughthe drum 7. 7

I do not limit my invention to the structure shown and described, asmany modifications, within the scope of the appended claims, may be madewithout departing from the spirit of my invention.

What I claim is v ,1. In a device of the kind described, an

upright drum closed at its, upper and lower ends and provided near itsbottom with a lateral discharge opening, a cup-shaped member mounted insaid drum with its bottom above said discharge opening, and its upperend spaced apart from the upper end of-said drum, said cup-shaped memberforming with the side walls of said drum one or more vertical passagescommunicating with the .spaces above and below said cup-shaped. beingand adapted to be connected at its upper the bottom of said cup-shapedmember, sub

end with a smoke pipe of astove or furnace and having its lower endspaced apart from stantially as set forth;

2. In a device of the kind described, the combination with a smoke pipeand a flue into which the pipe discharges, said pipe having two lateralopenings and a damper located in the pipe between said openings, of anupright drum having near its lower end a lateral discharge opening, acupshaped member in said drum having its bottom above said dischargeopening and its upper end spaceed apart from the upper end of said drum,the side walls of said cupshaped member forming with the side walls ofthe drum one or more vertical passages communicating with the spacesabove and below said member, a vertical pipe extending through the topof said drum and communicating with its upper end with one of saidlateral openings of said smokepipe and extending into said cup-shapedmember and having its lower end spaced apart from the bottom of thelatter, and a pipe communicating at its ends respectively with saiddischarge opening and with the other lateral opening of said smoke pipe,substantially as set forth.

3. In a device of the kind described, the combination with a smoke pipehaving two lateral openings and a damper intermediate of said openings,and a flue into which said pipe discharges, of a drum having anexpansion chamber and a lateral discharge opening below said chamber andhaving a vertical pipe communicating with one of said lateral openingsat its upper end and discharging at its lower end above the bottom ofsaid expansion chamber, the drum having means by which the expanded eousproducts of combustion after passing through said vertical pipe arecarried upwardly and then downwardly to said discharge opening, and apipe communicating at its ends with said discharge opening and with theother lateral opening respectively, substantially as set forth. a

In testimony whereof I, have signed my name to this specification.

' HENRY MIILLER.

